Wanted to do a partial mash as the 1st beer that 2 of my sons will be brewing with me so they can learn a bit about mashing and also how to make an extract beer. Having spent time in Duesseldorf, I've become partial to Altbier, but want a little something special for this occasion .... hence the Latzenbier or Sticke Alt. Not sure why I got such a low efficiency on this beer given that 66% of the malt came from extract.